As a general rule, open diesel fuel can last up to 1 month. If you have stored the diesel in a sealed container indoors or it is in a vehicle tank, it will last 6 months with no treatment. If you have treated the fuel with biocides and stabilizers, it will last 12 months. Longer than 12 months, it will require more maintenance.
The length of time the fuel will stay fresh in a sealed drum depends on the fuel itself. A non oxygenated fuel such as C12 should be used within a couple years.The fuel that is returned from the injector rail does not actually go into the tank directly but goes into a spiral "bowl" called a splash bowl on the bottom of the tank about 3 inches high and 6 to 8 inches in diameter. the return pipe keeps the splash bowl full and the the internal mesh fuel filter covered in gasoline. this is to keep the car
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